Screen for paper stock and the like



y 5, 1933. w. B. CLEMENTS ET AL SCREEN FOR PAPER STOCK AND THE LIKE Filed March 24', 1932 3 Sheets-Sheet l Wi ma'r 'fb l mcms Georqe P Burqqra BY WTTEE July 25, 1933. w. CLEMENTS ET AL SCREEN FOR PAPER STOCK AND THE LIKE Filed March 24, 1932 5 Sheets-Sheet 2 L m m mm kw C U T 5 m5 M e I 1 Q .flw W July 25, 1933.

W. B. CLEMENTS ET AL SCREEN FOR PAPER STOCK AND THE LIKE Filed March 24, 1952 3 Sheets-Sheet 3 I 'INVENTOR W|H|am B. Clements BY Georqe Patented July 25, 1933 I'IUNDITED {STATES PATE T O FIC 2 WILLIAM, B. CLEMENVTVS' AND elicits P BURGGRAF, or Micmosm ASSIGNORS 'ro BRYANT PAPER. COMPANY, or KALAMAZOO, MICHIGAN SCREEN FOR PAPER jsTooK AND THE LIKEJ Application filed Marchv 24, 1932. Serial, No. 600,868. g

i '1 The main objects of this invention are:

First, to provide a screen for paper stock in which clogging is substantially eliminated, and further, one in which the formation of lumps or strings of fiber is; eliminated.

Second, to provide ascreen for paper stock and the like .whichreduces foaming to a minimum.

-Third, to provide a screen for paper stock and the like having the above advantages which isof large capacity.

Objects relating to details and economies of our invention will appear from the description to. follow. The invention is de-' fined and pointed out in, the claims;

A structure which is a preferred embodiment of our invention is illustrated in the accompanying drawings, in which:

-Fig. 1 is an end elevation ofa screen for paper stock embodying our invention, certain parts being shown in conventional form, the upper spray pipebeing sectioned. I

ig. '2-is a fragmentary side elevationlooking from the right ofFig. 1

Fig. 3 is a fragmentary. plan View.

Fig. 4 is an enlarged fragmentary section ona line corresponding to line 4-4 of Figs.

3 and 5.

Fig. 5 isa fragmentary view looking from the left of'Fig. 4,"partially in elevation and partially in section.

Fig. 6 .is a fragmentary plan view of a' modified form or embodiment of our invention. I

Fig. 7 is a fragmentary end elevation looking from the leftof Fig.6. I Fig.8 is-an enlarged fragmentary view looking'from the right of Fig.7.

1 In the embodiment illustrated, 1 represents "a supporting pedestal and, 2 a flow or screening trough mounted thereon." This troughis provided with a plurality of screen plates or' elements 3 having slit-like apertures 4 which, in the embodimentshown in Figs. lto

14, are disposed longitudinally of the trough. The stock is introduced at? oneend Of the trough and flows acrossthe bottomfof the trough, the. trough having, in practice, 'a

.slightpitch.

Below the screens is a fleirible diaphragm centrally of the trough,

, bearings, one of which is indicate 5 actuated by a vibrating or shaker mecha nism designated genera-ll fjby the numeral 6. and driven from the pulley 7. 'As the 'details of this vibrating means form'no part of 7 this invention,'they arenot described herein,

it being sufiicient to. say that a suitable mecha nism is provided to. vibrate the diaphragm passage of the-stock .lect in strings, or to form small lumps on the underside of the screen which finally become detached and pass to the paper ma ring machine as lumps'orclusters of fibers, thereby resulting in objectionable lumps or spots in the paper, or slime may collect in thosame manner and form "objectionable spots.

To prevent the formation of such collections of fiber or'other material, and to. increase the capacity of the machine and prevent clogging thereof, we arrange a spray V pipe 8 longitudinally above and preferably ing a plurality of downwardly directed nozthis spray pipe hav-' zles 9 adapted to deliver fan-like. sprays or jets, theyoverlap as indicated in Fig.2.,

This spray pipe 8 isv mounted for oscillating movement, it being rotatably supported in v at 1 0 and provided with an arm 11 connected by the pit man12 to the crank disk 13, so that the spray pipe is rocked, the rocking being such that, the sprays sweep entirely across the. screen bottom of the-trough, effectively preventin ect, forcin'grthe, materig clogging and, in e throughrthe mesh or openings of the screen, and further, preventing objectionable foaming or frothing.

, In the embodiment illustrated inFigs. 1 to these sprays being positioned so'that 5 inclusive, we also provide under spray pipes lt which are arranged transversely. of the trough below the screen element and provided with jets 15' adapted to deliver fan-like sprays. These spray pipes are rotatably mounted and provided with slotted rocker" arms 16 engaged by pins 17 onthe slides 18 which are designed to constitute housings for the arms, these being carried by the rod 19,,

so that all the under spray pipes are simultaneously oscillated. These under spray 8, apair of longitudinally disposed spray v ipes. 20 are mounted below the screens for oscillatingomovement, these also being provided with nozzles adapted to deliver a fai1- shaped spray and being oscillated so that the sprays sweep across the underside of the screen. The operating connections for these spray pipes are not fully illustrated.

' Stock screens embodying our-improvements are highly efficient and eifectivein preventing the forming' of lumps or aggregates of foreign inaterials,i thereby resulting in a superior product and greatly reducing waste in the manufacture of paper.

fl We have illustrated certain practical emb odiments or adaptations of our improve ments, but we have not attempted to illustrate certain other embodiments, or adaptatio'nswhich we contemplate as it is believed that this disclosure will enable those skilled V in" the artto embody. oradapt our improve- .ments as may be desired.

Having thus described our invention, what we claim as new and desire to secure by Let- V ters Patent, is?

1. In a screen for paper stock and the like,

the'con'ibination with a trough provided with a foraminate'bottom consisting of a plurality of slitted screen elements disposed transversely of the trough and with their slits longitudinally ofthe trough, of an upper longi- 1 trally above said trough and provided with plurality of. nozzles delivering fan-shaped sprays longitudinally of the spray pipe and arranged so that the sprays of adjacent noz zles overlap, me'ansfor oscillating said upper spray pipe so that the. sprays discharged therefrom. sweep across the for'aminate bot tom of the trough at right angles to the slits, a plurality of under-spray pipes rotatably supported transversely below said trough and centrally relative to said screen elements and each provided with a plurality of nozzles discharging fan-shaped sprays longitudinally thereof against the under sides of the screen elements, and means for oscillating said under ,spray pipes so that the sprays therefrom sweep across the under sides of the screen elements in the direction of the slits.

' 2. In a screen for paper stock and'the like, 'thec'ombination with a trough provided with of 'slitted screen, elements disposed. transversely. of the trough and with their slits longitudinally of the trough, of 'a longitudinal spray ,piperotatably supported centrally above said trough and provided with a plutudinal spray pipe rotatably supported con-' aiforaminatebottomconsisting of a plurality rality of nozzles delivering fan-shaped sprays longitudinally of the spray pipe and arranged so that the sprays of adj aoent nozzles overlap, and means for oscillating said spray pipe so that the sprays discharged therefrom sweep across the foraminate bottom of the trough at right angles to the slits.

3. In a screen for paper stock and the like, the combination with a trough provided with a foraminatebottom consisting of a plurality of slitted. screen elements disposed transe versely of the trough and with their slits longitudinally of the trough, of a plurality of under spray pipes rotatably supported transversely below said trough and centrally relative to said screen elements and'each provided with a plurality of nozzlesdischarging fanshaped sprays longitudinally thereof against the under sides of the screen elements, and means for oscillating said under spray pipes so that the sprays therefrom sweep across the under sides of the screen elements in the direction of the slits.

4. In a screen for paper stock and the like, the combination with a trough provided with a foraminate bottom, the apertures-beingslitlike and disposed longitudinally I of the trough, of an upper spray pipe rotatably supported above said trough and provided with a plurality of nozzles delivering fan- 95 shaped sprays longitudinally of the spray pipe, means for oscillating said upper spray pipe so that the sprays discharged therefrom sweep acrossthe foraminate bottom of like and disposedv longitudinally offthe trough, of a spray pipe rotatably supported above said trough and provided with a plurality ofnozzles delivering fan-shaped sprays longitudinally of the spray pipe, and

means for oscillating said spray pipe so that '115 the sprays discharged therefrom sweep across the foraminate bottom of the trough at right angles to the slits. i

6. In a screen'for paper stock and the like, the combination with a trough provided with a foraminate bottom, the apertures being slitlike and disposed longitudinally of the trough, a-pluralityof under spray pipes ro tatably supported transversely. :below said trough and each'provided with a pluralityof 1 nozzles discharging fan-shaped sprays-longitudinally thereof against the under side of the foraminate bottomin the direction of the slits, and means for oscillatingsaid under spray pipes. I v

spray pipe rotatably supported above said trough and provided with a plurality of nozzles delivering fan-shaped sprays longitudinally of the spray pipe, means for oscillating said upper spray pipe so that the sprays discharged therefrom sweep across the foraminate bottom of the trough,'a plurality of under spray pipes rotatably supported transversely below said trough and each provided with a plurality of nozzles discharging fanshaped sprays longitudinally thereof against the under side of the foraminate bottom, and means for oscillating said under spray pipes.

8. In a screen for paper stock and the like, the combination with a trough provided with a foraminate bottom having longitudinally arranged slits, of a spray piperotatably supported above said trough for rotation about its longitudinal axis and provided with a plurality of nozzles delivering fan-shaped sprays longitudinally ofthe spray pipe, and

means for oscillating said spray pipe'so that the sprays discharged therefrom sweep across the foraminate bottomof the trough. v

9. In a screen for paper stock and the like, the combination with a trough provided with a foraminate bottom having longitudinal slits, a plurality of under spray pipes rotatably supported transversely below said trough for individual rotation about their longitudinal axis and each provided with a plurality of nozzles discharging fan-shaped sprays longitudinally thereof against the under side of the foraminate bottom, and means for oscillating said under spray pipes.

10. In a screen for paper stock and the like, the combination with a trough provided with a foraminate bottom having longitudinal openings, of an upper spray pipe supported above said trough for oscillating movement so that the water discharged therefrom sweeps across the foraminate bottom ofthe trough, and under spray pipes supported below said trough for oscillating movement to discharge against the under side of the foraminate bottom and so that the water is dis- 7 charged with a sweeping movement as the under spray pipes are oscillated. v

11. In a screen for paper stock and the like,

the combination with a trough provided with; a foraminate bottom having longitudinally arranged slit-like apertures, of a longitudinal spray pipe supported above said trough for oscillatin movementso that the water dis chargedft 'erefrom sweeps across the foraminate bottom of the trough at right "angles to the slit-like apertures. V

12. In a screen for- -paper stock'and the like, the combination with a trough provided with a foraminate bottom havinglongitudinally arranged slit-like apertures, of trans verse under spray pipes supported below said trough for oscillating movement to discharge against the under side ofthe foraminate bottom and so thatthe water is discharged with a sweeping movement in the direction of the slit-like apertures as the under spray pipes are oscillated. r

13. In a screen for paper stock and the like, the combination with a trough provided with a foraminate bottom having longitudinally arranged slit-like apertures, of atrans verse spray pipe mounted for. oscillating movement about its longitudinal axis and provided with a plurality of nozzles jdeliv'erg ing fan-shaped sprays longitudinally of the spray pipe andarranged so that the sprays of adjacent nozzlesoverlap and so that the water discharged therefrom sweeps across the fo raminate bottom as'the pipe is oscillatedi 14. In a screen for paper stock and the like, the combination with a trough provided with a foraminate bottom having longitudinally arranged slits, of a spray pipe mounted for oscillating movement about its longitudi-v nal axis and having-lateral wall ports. ar I ranged so that the water dischargedthere. from'sweeps across the foraminate bottom as the pipe is oscillated. j

15. A paper stock screening device'comprising in combination a trough having slitlike apertures in the bottom thereof extending in the same general direction, an upper spray pipe mounted above said trough for'rotation about its longitudinal axis and extending in same direction as v the slit-like apertures, whereby whenthe pipeis oscillated the spray sweeps across'the slit-like aperturesat right ng 1 I angles thereto, a lower spray pipe mounted below said trough for rotation about its 1on gitudinal axis and extending at right angles, 7

to the direction of the slit-like apertures, whereby when the pipe is oscillated thespra'y sweeps through the slit-likeapertures in the same direction as they extend,and means for; oscillating said pipes simultaneously, wheres 1 by their sprays coact to breakup lumps in i x a the stock abovethe slit-likeapertures.

' WILLIAM. B; (ELEMENTS;

GEORGE P. BURGGRA F, 

